| nitrogenase | <enzyme> Nitrogenase is a member of a family of enzymes found in nitrogen fixing bacteria that reduce nitrogen to ammonia (also ethylene to acetylene). (18 Nov 1997) |
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| nitrogenase complex | <biochemistry> A system of enzymes used by nitrogen-fixing ATP is present. (09 Oct 1997) |
| nitrogenase reductase | <enzyme> Fe protein component of mo-fe protein nitrogenase in rhodospirillum rubrum; part of the molybdenum nitrogenase which is nifhdk Registry number: EC 1.18.2.- Synonym: nitrogenase iron protein, nitrogenase fe protein, fe protein, nitrogenase, nifh protein, nifh gene product (26 Jun 1999) |
| nitrogenize | <chemistry> To combine, or impregnate, with nitrogen or its compounds. Origin: Nitrogenised; Nitrogenizing. Source: Websters Dictionary (01 Mar 1998) |
| nitrogenous | <chemistry> Of, pertaining to, or resembling, nitrogen; as, a nitrogenous principle; nitrogenous compounds. Nitrogenous foods. See Note under Food. Source: Websters Dictionary (01 Mar 1998) |
| nitrogenous base | <biochemistry> A nitrogen-containing molecule having the chemical properties of a base. (09 Oct 1997) |
| nitrogenous group transferases | <enzyme> Enzymes that catalyze the transfer of nitrogenous groups, primarily amino groups, from a donor, generally an amino acid, to an acceptor, usually a 2-oxoacid. Registry number: EC 2.6 (12 Dec 1998) |
| nitroglycerin | <chemistry> A liquid appearing like a heavy oil, colourless or yellowish, and consisting of a mixture of several glycerin salts of nitric acid, and hence more properly called glycerin nitrate. It is made by the action of nitric acid on glycerin in the presence of sulphuric acid. It is extremely unstable and terribly explosive. A very dilute solution is used in medicine as a neurotic under the name of glonion. A great number of explosive compounds have been produced by mixing nitroglycerin with different substances; as, dynamite, or giant powder, nitroglycerin mixed with siliceous earth; lithofracteur, nitroglycerin with gunpowder, or with sawdust and nitrate of sodium or barium; Colonia powder, gunpowder with nitroglycerin; dualin, nitroglycerin with sawdust, or with sawdust and nitrate of potassium and some other substances; lignose, wood fibre and nitroglycerin. Pharmacologic action: Relaxes smooth muscle - dilates veins, dilates coronary arteries, reduces left ventricular filling pressure, lowers systemic vascular resistance, decreases myocardial oxygen demand. Uses: Treat angina pectoris. Dose: One tablet (0.3 to 0.4 mg) sublingual, may repeat twice at 5 minute intervals Intravenous infusion: 0.5 - 2 mcg/kg per min. Potential complications: May cause hypotension, especially if hypovolemic; headache is common. Alternative forms: nitroglycerine. Origin: Nitro- + glycerinn. (17 Mar 2000) |
| nitroglycerin reductase | <enzyme> Pseudomonas fmn-containing enzyme that catalyses NADPH-dependent denitration of nitroglycerin, yielding nitrite Registry number: EC 1.7.99.- (26 Jun 1999) |
| nitrohydrochloric | <chemistry> Of, pertaining to, or containing, nitric and hydrochloric acids. Nitrohydrochloric acid, a mixture of nitric and hydrochloric acids, usually in the proportion of one part of the former to three of the latter, and remarkable for its solvent action on gold and platinum. Synonym: nitromuriatic acid, and aqua regia. Origin: Nitro- + hydrochloric. Source: Websters Dictionary (01 Mar 1998) |
| nitrohydrochloric acid | An extremely caustic mixture that contains 18 parts nitric acid and 82 parts hydrochloric acid. Synonym: aqua regia, aqua regalis, nitrimuriatic acid. (05 Mar 2000) |
| nitrohydroxyiodophenylacetate | <chemical> 3-nitro-4-hydroxy-5-iodophenylacetate. Also called 4-hydroxy-3-iodo-5-nitrophenylacetate. A haptenic determinant that can be radiolabelled and used as salts and derivatives for investigations of immunogenic specificity studies. Chemical name: Benzeneacetic acid, 4-hydroxy-3-iodo-5-nitro- (12 Dec 1998) |
| nitroid shock | A syndrome resembling that produced by the administration of a large dose of a nitrite, sometimes caused by a too rapid intravenous injection of arsphenamine or some other drug. See: nitritoid reaction. (05 Mar 2000) |
| nitrol | <chemistry> Any one of a series of hydrocarbons containing the nitro and the nitroso or isonitroso group united to the same carbon atom. Source: Websters Dictionary (01 Mar 1998) |
| nitroleum | <chemistry> Nitroglycerin. Origin: NL, fr. L. Nitrum natron + oleum oil. Source: Websters Dictionary (01 Mar 1998) |